A man pushes with a force of 150 N on a bookcase with a weight of 100kg. The coefficient of static friction between the bookcase and the floor is 0.65. Because of friction, the bookcase does not move. What is the force of friction on the bookcase?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

What is the role of lenses in microscopy?

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?